I'm trying to create a default filter for the Tasks view when I click on a particular project (this one is called 'Cafe construction') in the kanban view. 

For this filter, I don't want to see any child tasks.  If I select 'Parent Tasks' 'is not set' in the advanced search section it works fine and all of the tasks which have a Parent Task disappear.  If I save that filter and tick the 'Use by default' box, my understanding is that the filter terms should be automatically inserted in the Tasks view when I click Projects/Cafe construction.  This is not happening though. 

I have to manually click the search term in the 'Favourites' list.  I have used the 'Use by default' option successfully in other parts of Odoo, including for the 'Parent Tasks is not set' search term, but it's just not working for this view.  Can someone help?